[coreboot] [PATCH] Cleanup up HD audio codec / hda_verb.h files

[Uwe Hermann]

See patch.

Most of the hda_verb.h files can be safely dropped as they're unused
(and/or incorrect).

I own the MSI MS-7260 and will provide a working hda_verb.h file for
that at some later point, and also for my upcoming ASUS M2N-E port.

Uwe.